Modern churches can prove one of the most tricky places to sing in, as they are often designed with unusual angles and set up for modern worship with a four piece band using amplification. At one such church recently, an organist had been booked to play, but no instructions had been left as to how to use the electronic keyboard with the sound system. So we spent 15 minutes grabbling around with leads and switches before we could start rehearsing - thanks goodness for years of touring opera with a digital piano! Only then could we work out the best place to stand for the best acoustic - 5 minutes before the first mourners came in from the cold.
Crematorium chapels are usually surprisingly good, although we'll tend to direct our sound upwards to make the most of the reflective qualities of the roof (carpet absorbs sound like a sponge, as do curtains, drapes and foliage.) We'll also spend time to make sure we're in the optimum position to be heard and seen as part of the service, whether religious or otherwise.
By the time the family and mourners arrive, of course, we've sorted all these issues out. All they see is a professional soloists who is involved in the services, appears calm and confident, and sounds great in the space. And that's the way we like it.